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History
Trachyte
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Trachyte is an extrusive igneous rock composed mostly of alkali feldspar. It is usually light-colored and aphanitic (fine-grained), with minor amounts of mafic minerals, and is formed by the rapid cooling of lava enriched with silica and alkali metals. It is the volcanic equivalent of syenite.
A cut sample of trachyte, with phenocrysts of sanidine, in a wall in Germany
A cut sample of trachyte, with phenocrysts of sanidine, in a wall in Germany
Polished opal on trachyte
Polished opal on trachyte
The Breadknife is a peralkaline trachyte dike in the Warrumbungles of eastern Australia.
The Breadknife is a peralkaline trachyte dike in the Warrumbungles of eastern Australia.
Iron Pot is one of several trachyte plugs in the Hedlow Creek region west of Yeppoon in Central Queensland.
Iron Pot is one of several trachyte plugs in the Hedlow Creek region west of Yeppoon in Central Queensland.
Igneous rock
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Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava.
Geologic provinces of the world (USGS) Shield Platform Orogen Basin Large igneous province Extended crust Oceanic crust: 0–20 Ma 20–65 Ma >65 Ma
Geologic provinces of the world (USGS) Shield Platform Orogen Basin Large igneous province Extended crust Oceanic crust: 0–20 Ma 20–65 Ma >65 Ma
Volcanic eruptions of lava are major sources of igneous rocks. (Mayon volcano in the Philippines, erupting in 2009)
Volcanic eruptions of lava are major sources of igneous rocks. (Mayon volcano in the Philippines, erupting in 2009)
Natural columns of igneous rock separated from each other by columnar joints, in Madeira
Natural columns of igneous rock separated from each other by columnar joints, in Madeira
Formation of igneous rock
Formation of igneous rock